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Inventory Impairments and Land Option Contract Abandonments (Narratives) (Details) | 3 Months Ended | 6 Months Ended
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May 31, 2021 USD ($) delivery property lot Rate | Nov. 30, 2020 USD ($) property | May 31, 2020 USD ($) delivery | May 31, 2021 USD ($) delivery lot Rate | May 31, 2020 USD ($) delivery
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |  |  |  |  |  |  |  |
Number of land parcels or communities evaluated for recoverability | property |  | 6 | 11 |  |  |  |  |  |
Carrying value of communities or land parcels evaluated for impairment |  | $ 78,500,000 | $ 123,400,000 |  |  | $ 78,500,000 |  |  |
Inventory impairment charges |  | 0 |  | $ 0.0 |  | 3,600,000 |  | $ 5,100,000 |
Aggregate carrying value of inventory impacted by pretax, noncash inventory impairment charges |  | $ 90,200,000 | $ 113,100,000 |  |  | $ 90,200,000 |  |  |
Number of communities and various other land parcels impacted by pretax, noncash inventory impairment charges |  | 13 | 16 |  |  | 13 |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |  |  |  |  |  |  |  |
Average Selling price | [1] | $ 0 |  | $ 0 |  | $ 471,000 |  | $ 302,700 |
Deliveries per month | delivery | [1] | 0 |  | 0 |  | 5 |  | 1 |
Discount Rate, Percent | [1] | 0.00% |  | 0.00% |  |  |  | 17.00% |
Minimum [Member] | Measurement Input, Discount Rate [Member] |  |  |  |  |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |  |  |  |  |  |  |  |
Discount Rate, Percent | Rate | [1] |  |  |  |  | 19.00% |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |  |  |  |  |  |  |  |
Average Selling price | [1] | $ 0 |  | $ 0 |  | $ 471,000 |  | $ 915,500 |
Deliveries per month | delivery |  | 0 |  | 0 | [1] | 5 | [1] | 4 | [1]
Discount Rate, Percent |  | 0.00% |  | 0.00% |  |  |  | 18.00% |
Maximum [Member] | Measurement Input, Discount Rate [Member] |  |  |  |  |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |  |  |  |  |  |  |  |
Discount Rate, Percent | Rate | [1] | 0.00% |  |  |  | 19.00% |  |  |
Land Option Contract Abandonment [Member] |  |  |  |  |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31) |  |  |  |  |  |  |  |  |
Land option contract abandonment charges |  | $ 500,000 |  | $ 4,400,000 |  | $ 900,000 |  | $ 4,900,000 |
[1] | The ranges of inputs used in each period primarily reflect differences between the housing markets where each impacted community is located, rather than fluctuations in prevailing market conditions.

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